1 /* $OpenBSD: src/usr.sbin/ntpd/imsg.c,v 1.10 2005/03/23 10:42:04 henning Exp $ */
4 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 #include <sys/types.h>
29 imsg_init(struct imsgbuf *ibuf, int fd)
31 msgbuf_init(&ibuf->w);
32 bzero(&ibuf->r, sizeof(ibuf->r));
39 imsg_read(struct imsgbuf *ibuf)
43 if ((n = read(ibuf->fd, ibuf->r.buf + ibuf->r.wpos,
44 sizeof(ibuf->r.buf) - ibuf->r.wpos)) == -1) {
45 if (errno != EINTR && errno != EAGAIN) {
46 log_warn("imsg_read: pipe read error");
58 imsg_get(struct imsgbuf *ibuf, struct imsg *imsg)
60 size_t av, left, datalen;
64 if (IMSG_HEADER_SIZE > av)
67 memcpy(&imsg->hdr, ibuf->r.buf, sizeof(imsg->hdr));
68 if (imsg->hdr.len < IMSG_HEADER_SIZE ||
69 imsg->hdr.len > MAX_IMSGSIZE) {
70 log_warnx("imsg_get: imsg hdr len out of bounds");
73 if (imsg->hdr.len > av)
75 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
76 ibuf->r.rptr = ibuf->r.buf + IMSG_HEADER_SIZE;
77 if ((imsg->data = malloc(datalen)) == NULL) {
81 memcpy(imsg->data, ibuf->r.rptr, datalen);
83 if (imsg->hdr.len < av) {
84 left = av - imsg->hdr.len;
85 memmove(&ibuf->r.buf, ibuf->r.buf + imsg->hdr.len, left);
90 return (datalen + IMSG_HEADER_SIZE);
94 imsg_compose(struct imsgbuf *ibuf, enum imsg_type type, u_int32_t peerid,
95 pid_t pid, void *data, u_int16_t datalen)
100 if ((wbuf = imsg_create(ibuf, type, peerid, pid, datalen)) == NULL)
103 if (imsg_add(wbuf, data, datalen) == -1)
106 if ((n = imsg_close(ibuf, wbuf)) < 0)
113 imsg_create(struct imsgbuf *ibuf, enum imsg_type type, u_int32_t peerid,
114 pid_t pid, u_int16_t datalen)
119 if (datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
120 log_warnx("imsg_create: len %u > MAX_IMSGSIZE; "
121 "type %u peerid %lu", datalen + IMSG_HEADER_SIZE,
126 hdr.len = datalen + IMSG_HEADER_SIZE;
130 if ((wbuf = buf_open(hdr.len)) == NULL) {
131 log_warn("imsg_create: buf_open");
134 if (imsg_add(wbuf, &hdr, sizeof(hdr)) == -1)
141 imsg_add(struct buf *msg, void *data, u_int16_t datalen)
144 if (buf_add(msg, data, datalen) == -1) {
145 log_warnx("imsg_add: buf_add error");
153 imsg_close(struct imsgbuf *ibuf, struct buf *msg)
157 if ((n = buf_close(&ibuf->w, msg)) < 0) {
158 log_warnx("imsg_close: buf_close error");
166 imsg_free(struct imsg *imsg)